George mayr



{No Model.) 2 ShBGtS-Sh86t 1.

G.MAYR. DRIVING MECHANISM FOR BICYCLE DYNAMOS. No. 553,035. Patented Jan. 14, 1896.

N5 Model.) I 2 Sh'eetsSheet 2.

G. MAYR. DRIVING MECHANISM FOR BICYCLE DYNAMOS.

3% ZIW UNITED STATES PATENT OFFICE.

GEORGE MAYR, OF BROOKLYN, ASSIGNOR OF ONE-HALF TO ELKIN FARMER, OF NEXV YORK, N. Y.

DRIVING MECHANISM FOR BlCYCLE-DYNAMOS.

SPECIFICATION forming part of Letters Patent No. 553,035, dated January 14, 1896.

Application filed January 5, 1895. Serial No. 533,945. (No model.)

To asZZ whont it may concern:

Be it known that I, GEORGE MAYR, a citizen of the United States, residing at Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Electric Lamps for Bicycles and other Vehicles, which improvements are fully set forth in the following specification and accompanying drawings, and in the latter- Figure l is aside elevation of a generator embodying my improvements, the driven pulley being removed from the spur-wheel shaft. Fig. 2 is a plan view of same, the pulley above referred to being retained in position upon the spur-wheel shaft and the field-magnets being removed. Fig. 3 is an end view. Fig. at is a view showing my improved generator applied to a bicycle. Fig. 5 is a detail view showing construction of driving-pulley and application thereof to a rotatable object, as the hub of a bicycle-wheel.

Similar reference-letters denote like parts throughout the several views.

This invention relates generally to that class of appliances known as bicycle or vehiole lamps, and particularly to that type of lamp in which the production of light is effected through the medium of current-electricity, the latterbeing generated by means of a dynamo-electric machine. Its object is to provide an electric lamp for bicycles and other moving vehicles in which the current-electricity shall be generated by means of a dynamo-electric machine, the disposition of which, with reference to the bicycle or other vehicle in connection with which it is used, shall be such as to render practicable the communication thereto of motion from some rotatable element of the bicycle or vehicle-- as the hub of one wheel of the bicycle or axle of the vehicle-in the event of such element being turned or rotated; which shall admit -of ready application to and removal from a bicycle or other vehicle, and which shall be simple and cheap in construction and efficient in operation.

The invention consists of the novel arrangement and disposition of the various parts, of certain combinations thereof, and of certain details of construction, all of which will be specifically referred to hereinafter.

Having reference to the accompanying drawings, the letter A denotes the field-magnets, preferably of the permanent type and in form approximating a horseshoe. These field-magnets may be wound as in common practice, if deemed advisable. At the top they are bound together by means of the rod a, plates 1), and nuts 0, and near the bottom they are bound together by means of the side rods a a, end frame-piece b, cross-rod c and nuts cl. The frame-piece B is secured to the cross-rod c in any convenient and well-known manner, as by means of screws.

The armature-shaft O is preferably provided at each end with a pivotal bearing, as the pointed screw 6, the'end of said shaft being suitably recessed to receive this screw.

Armature parts of any approved design may be applied to the shaft 0 and suitably wound with insulated wire, the latter being properly brought in circuit with the commutator-sections f f, in contact with which stand the brushes 9 g. WVires h h, respectively, lead from these brushes to the lamp, which may be of any approved construction, and attached to a convenient portion of the bicycle or vehicle frame in any simple manner.

For imparting the essential rotary motion to the armature-shaft I provide the latter, at the rear end thereof, with a worm-thread G into which mesh the teeth of the spur-wheel D, the latter being firmly mounted upon the shaft E. The teeth of the spur-wheel D are beveled, as shown, to conform to the pitch of the said worm-thread. The shaft E bears centrally and at its rear end in the framepiece F at right angles to the armature-shaft O. A stop i, the function of which will appear later on, passes through the shaft E at a suitable point therein. There is loosely mounted upon the outwardly-projecting end of the shaft E a pulley G, preferably provided with two grooves in its peripheral face. The hub of this pulley G is recessed, as shown, to the end that engagement of this recess by the stop 1' may be effected through displacement of the pulley G longitudinally inward along the shaft E, and disengagement thereof may be effected by displacement of said pulley in the opposite direction along said shaft. It will be understood that in the former case the shaft E will rotate with the pulley G, thereby imparting the requisite rotary motion to the armature-shaft 0 through the medium of the spur-whee1 D and the thread 0, while in the latter case the shaft E will remain stationary, the pulley G rotating thereon. The parts being thus formed and disposed, it is onlynecessary, when displacement of the pulley G, as stated, becomes desirable, to shift by hand the driving connection 9' from one groove of the pulley G to the other. To render positive the service of the driving connection, how ever, I make use of a tighteuer, which consists of the arm L, disposed and adapted to swing upon a suitable support, as m, and a loose pulley n, carried by the arm I at the free end thereof. This tightener is so disposed that the pulley it stands in vertical alignment with the driving connection j and rests upon it when the arm I is swung into the position shown.

\Vhen my invention is used in connection with a bicycle, I prefer to apply to the hub of one wheel thereof a pulley of common form or made in sections and bolted in place, as shown in Fig. 5; and in the application of my invention to a bicycle the generator is secured in any common manner to a suitable por tion of the frame, and a driving pulley, as H, is suitably mounted to receive motion from some rotatable element of the bicycle, and carries the driving connection 7', which leads to and around the generator-pulley G. Now upon the bicycle-wheel being turned, as when the bicycle is propelled by a rider, proper motion is imparted to the armature-shaft through the medium of the intervening elements, and results in generating the neces sary current for feeding the lamp Lwhich cur rent is conducted to and from said lamp by means of the wires h h.

I do notlimit myself to the precise construe tion shown and described herein, as the details thereof may be materially Varied without departing from the spirit of my invention.

\Yhat I claim as my invention, and desire to secure by Letters Patent, is

1. In combination with a bicycle, having a driving medium on one wheel thereof, an electric generator, comprising an armature shaft provided with a worm-thread, and a secondary shaft provided with a stop, as "1?, and carryin g aworm-wheel, the latter adapted to mesh with said worm-thread, a pulley, adapted to be thrown into and out of engagement with said stop, on said secondary shaft, and a driving connection on said driving medium and said pulley, all substantiallyas described and for the purpose set forth.

2. In combination with a bicycle, having a driving medium on one wheel thereof, an electric generator, comprising an armature shaft provided with a worm-thread, and a secondary shaft carrying a worm-wheel and provided with a stop, as 71, the said worm-wheel being adapted to mesh with said worm-thread, a pulley on the secondary shaft, the said pulley having two peripheral grooves and admitting of being thrown into and out of engagement with said stop, a driving connection on said driving medium and said pulley, and a tightener, adapted to take up the slack in said driving connection, all substantially as de scribed and for the purpose set forth.

GEORGE MAYR. Witnesses:

A. A. LAKE, ARTHUR J. LEVY. 

